| IO | French dramatist (born in Romania) who was a leading exponent of the theater of the absurd (1912-1994) |
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| IO | region of western Asia Minor colonized by Ancient Greeks |
| IO | a member of one of the four divisions of the prehistoric Greeks |
| IO | the second Greek order |
| IO | an arm of the Mediterranean Sea between western Greece and southern Italy |
| IO | the dialect of Ancient Greek spoken in Ionia |
| IO | (architecture) an order of classical Greek architecture |
| IO | containing or involving or occurring in the form of ions |
| IO | a chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion |
| IO | the charge on an ion is equal to a constant charge e multiplied by an integer from 1 to 15 |
| IO | the second Greek order |
| IO | the process of ionizing |